Heat-Resisting Clear Double Wall Water Glass Cups Drinking Tea-PotThis Double Wall Water Glass Cup is made with no-toxic borosilicate. It is ultra-clear, durable and heat and cold resistant. It can come with a stainless steel mesh infuser filter for loose tea. The double wall design keeps liquid in it hot or cold for a longer period of time while the outer glass wall remains cool and prevents condensation. It is perfect for brewing coffee, tea, hot or cold beverages. China Ware Glass supplierswebsite:http://www.7glassware.com/drink-ware/ware-glass/